it's the one james, san jose california, you're on with author kenneth davis. >> caller: good morning, mr. davis. mr. davis, you mentioned columbus discovering the new world, but i read that the vikings were it the first on the east coast. and before them came a navigator from ireland. do you have any historical the information on these two? >> guest: short. i address both of those questions in don't know much about geography. one is much more easily incident the other because certainly the vikings were here, when i say here, in north america close of 500 years before columbus arrived. the site of the viking village that they left behind has been excavated. it is now a unesco world heritage site up in newfoundland so that evidence is quite clear and overwhelming. the part of the story that connects to columbus, however, was always the idea that, perhaps, there was some way that columbus knew about the vikings having sailed here. there was even a map that later proved to be a fraud that was said to be something columbus had. there is no evidence to suggest that columbus knew about the